Comprehensive Bolt Sizing: Identify 34 bolt sizes swiftly with our thread checker, including 16 metric sizes from M3 x 0.5 to M16 x 2.0 and 20 standard sizes from #6 - 32 Coarse to 3/4 - 16 Fine. This tool is essential for ensuring compatibility with all standard hardware. Precision Craftsmanship: Constructed using advanced CNC machining, our thread checkers deliver precise measurements for both internal and external threads. This tool is ideal for quick identification, though it's not suitable for non-standard nut shapes. Versatile Mounting and Measurement: Features six pre-set mounting holes for easy installation on walls or toolboxes, dual-sided scales (15 cm and 6 inches) accuracy, and removable non-slip feet for stable operation. Enhanced Measurement Capabilities: Equipped with 19 different size drill gauges ranging from 4mm to 14mm metric and 1/16" to 1/2" imperial, our bolt identifier board simplifies the process of measuring drill bits, enhancing your toolkit's functionality. Essential for Various Professions: A must-have for professionals and DIY enthusiasts alike, this bolt and nut gauge keeps all components secure and organized. It's perfect for auto mechanics, carpenters, welders, plumbers, and workshop technicians. Color: As Shown Material: Aluminum Alloy Package Contents: 1* Thread inspector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.